Accordion



case extension having cut-out portions, and said ring having bayonetslots in substantial registry with the case cut-outs, said cut-outs andslots being adapted to receive retaining portions of the cap, and a lockshoulder being provided by the case extension and ring adapted toreceive a lock portion of said cap.

5. In a lock-switch coil unit, having a case extension, and a cap withlock and retaining portions telescopically engaging the case extensionfor enclosing a terminal, the combination with said case extension of aretainer ring, means securing the ring within the case extension, saidcase extension having cut-out portions, and said ring having bayonetslots in substantial registry with the case cut-outs, said cut-outs andslots being adapted to receive retaining portions of the cap, meansincluding an aperture of the ring and a depressed portion of the caseextension providing a lock recess adapted to receive a lock portion ofthe cap, said depressed portion of the case extension coinciding withthe ring aperture and having a pair of aligned slits in registry with anedge of the ring aperture providing a lock shoulder adapted to beengaged by a lock portion of the cap, and means including a tangextending between the slits and integrally connecting the main body ofthe case extension and the depressed portion, preventing the lockportion of the cap being inserted between the ring and case extension.

6. In a lock switch coil unit, having a case extension, and a cap withlock and retaining portions telescopically engaging the case extensionfor enclosing a terminal, the combination with said case extension of aretainer ring having cutout portions, some of which provide bayonetslots, means securing the ring within the case extension, said caseextensions having cutout portions in substantial registry with thebayonet slots and having a portion thereof depressed into another of thering cutouts to provide a lock receiving recess having a lock engagingshoulder, there being a tongue of metal of the case extending across theshoulder to prevent a lock portion of the cap entering between the ringand case extension, said cutouts and slots being adapted to receive thelock and retainer portions of the cap for effecting a concealed lockingassembly.

LESLIE O. PARKER.

W. G. VESPA Sept. 19, 1939.

ACCORDION Filed Jan. 3, 1938 I6 I //1 l! INVENTOR. M/LL/HM G. VESP/q BYATI'ORNEYs

